For those that haven't witnessed it, I will describe a very easily constructed experiment to demonstrate this phenomena that I have discovered: first stretch a string tightly and then quickly flick it with your finger, stressing it even more. If you listen, you will hears a sound emitted by the stressed string that gradually dies off as the string recovers. Nearby strings will start vibrating in sympathy (if they are tuned properly). Could one string be communicating with the other strings?
Common objects may be used to make the experiment easier to perform: banjos, guitars, violins, etc.